American Flyer steam HO - Won't smoke

I got this HO American Flyer 4-6-4 (Maybe 2-6-4 or 4-6-2 can’t remember) NYC engine from my Dad. The tender is the pickup and the motor is in the engine. I know he had it in the mid 60’s maybe earlier. It runs fine. Sounds good. Well it did not smoke well but it did smoke. About a month ago I thought it needed more smoke fluid. I couldn’t find the little squeeze bottle I normally use so I used this other bottle. The drops were much bigger. Basicly it overflowed after about three drops. I tried to clean out the excess. Now the engine won’t smoke at all. Any ideas?

Ted from Ohio.